Test with Julia LTS too

[mlxd]

Given the compat tag of the package lists Julia as 1.x compatible, it may be a good idea to test with both the LTS version of Julia, as well as a more recent (1.4/1.5) version. Otherwise, updating the compat to the lowest supported version and testing with this should be sufficient.

[sp94]

I just tried installing PyPlot on Julia 1.0.5 and had a compatability error

(v1.0) pkg> add PyPlot
  Updating registry at `~/.julia/registries/General`
  Updating git-repo `https://github.com/JuliaRegistries/General.git`
 Resolving package versions...
ERROR: Unsatisfiable requirements detected for package PyPlot [d330b81b]:
 PyPlot [d330b81b] log:
 ├─possible versions are: [2.6.1-2.6.3, 2.7.0, 2.8.0-2.8.2, 2.9.0] or uninstalled
 └─restricted to versions 2.6.0 by an explicit requirement — no versions left

The lowest version that works without changes is Julia v1.3. I'll update the compat tag to 1.3 and above. I think the next LTS version of Julia is relatively soon (1.6)

[sp94]

The latest tests passed on 1.3